package com.life.aspect;

import com.life.annotation.AutoFill;
import com.life.constant.AutoFillConstant;
import com.life.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 自动填充切入点
     */
    @Pointcut("execution(* com.life.mapper.*.*(..)) && @annotation(com.life.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    /**
     * 自动填充
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段自动填充...");
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = annotation.value();
        Object[] args = joinPoint.getArgs();
        if (args != null && args.length == 0) {
            return;
        }
        Object entity = args[0];
        LocalDateTime now = LocalDateTime.now();
        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if(operationType == OperationType.INSERT){
            //为4个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                //通过反射为对象属性赋值
                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if(operationType == OperationType.UPDATE){
            //为2个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                //通过反射为对象属性赋值
                setUpdateTime.invoke(entity,now);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
